List Indexing in Python

Lists keep several related values together, but sometimes you need just one of them. This Block introduces list indexing through small, practical examples. You will learn how Python numbers list positions, how to retrieve items from either end, and what happens when a requested position does not exist.

What you will learn:

• Retrieve individual list items using square brackets
• Work with Python's zero-based indexes
• Store an index in a variable and use it to select an item
• Retrieve the last and second-to-last items with negative indexes
• Connect len() with the last valid positive index
• Recognize and understand IndexError
• Read values without changing the original list

By the end, you will be able to pick exactly the item you need while keeping your list safely unchanged.